How do front-end optimization consultants improve website performance?

Front-end optimization consultants improve website performance by optimizing code, assets, and rendering. They minimize and optimize CSS and JavaScript, implement code splitting, optimize images (compression, modern formats, lazy loading), reduce HTTP requests, enable browser caching, and optimize critical rendering paths. They use performance monitoring tools to identify bottlenecks and measure improvements. Good consultants focus on Core Web Vitals (LCP, FID, CLS) which affect both user experience and search rankings. They balance performance with functionality—ensuring optimizations don't break features. Typical improvements include 50-70% reduction in load times and significant improvements in Core Web Vitals scores.